20 000 000 Mark Obercassel im Siegkreis

Obercassel im Siegkreis was a small municipality on the right bank of the Rhine, administratively distinct from the Düsseldorf suburb of Oberkassell — a distinction that still confuses collectors. This note was issued by the local Bürgermeisterei during the hyperinflation peak of 1923, when municipal and commercial entities across Germany were forced to print their own emergency currency, Notgeld, to compensate for the Reich's inability to supply adequate denominations fast enough to keep pace with collapsing purchasing power.

Printed locally by Johannes Düppen, whose press served several small Siegkreis communities during this period. The signature of I. V. Wiegandt — issued "in Vertretung," meaning on behalf of the Bürgermeister — suggests the note was authorized and signed by a deputy rather than the mayor directly.